Material specification page for retaining ring (circlip) in A4 Stainless Steel. Covers the grade designation (A4-80 (316)), corrosion and magnetic behavior, comparable grades and their trade-offs, and the sizes available to ISO / DIN.
Why Choose A4 Stainless Steel for Retaining Ring (Circlip) — ISO / DIN (Series 151)
Specified for marine, coastal and chemical applications. For retaining ring (circlip) — iso / din (series 151), this matters when superior, including marine and chloride environments is the primary requirement.
Mechanical & Physical Properties
| Grade designation | A4-80 (316) |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C |
| Corrosion characteristic | Superior, including marine and chloride environments |
Corrosion Behavior in Service
A4 (316) adds 2–3% molybdenum to the A2 (304) composition, which dramatically improves resistance to chloride-pitting corrosion. For Retaining Ring (Circlip) — ISO / DIN (Series 151) in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Comparable Grades
For Retaining Ring (Circlip) — ISO / DIN (Series 151), the alternative stainless grade is A2 (304). A2 (304) suits general indoor and outdoor service; A4 (316) adds molybdenum for marine and chloride environments. Where higher strength matters more than corrosion, switch to plated alloy-steel class 8.8 or 10.9.
Sizes of Retaining Ring (Circlip) — ISO / DIN (Series 151) Available in A4 Stainless Steel
| Nominal diameter (mm) | Ring diameter d1 (mm) | Groove diameter d2 (mm) | Thickness s (mm) | Type | Reference standard |
|---|---|---|---|---|---|
| 8 | 7.4 | 7.1 | 0.8 | External | DIN 471 / GB/T 894 |
| 10 | 9.3 | 9.0 | 1.0 | External | DIN 471 / GB/T 894 |
| 12 | 11.1 | 10.8 | 1.0 | External | DIN 471 / GB/T 894 |
| 16 | 15.0 | 14.7 | 1.0 | External | DIN 471 / GB/T 894 |
| 20 | 19.0 | 18.7 | 1.2 | External | DIN 471 / GB/T 894 |
| 25 | 23.9 | 23.6 | 1.2 | External | DIN 471 / GB/T 894 |
| 30 | 28.9 | 28.6 | 1.5 | External | DIN 471 / GB/T 894 |
| 40 | 38.5 | 38.2 | 1.75 | External | DIN 471 / GB/T 894 |
| 50 | 48.5 | 48.2 | 2.0 | External | DIN 471 / GB/T 894 |
| 60 | 58.3 | 58.0 | 2.0 | External | DIN 471 / GB/T 894 |
| 80 | 78.0 | 77.7 | 2.5 | External | DIN 471 / GB/T 894 |
| 100 | 98.0 | 97.7 | 3.0 | External | DIN 471 / GB/T 894 |